/Engine/Plugins/Experimental/GizmoEdMode/Source/LightGizmos/Public/ScalableConeGizmo.h
Check if the input ray hits the cone. The hit testable parts of the cone currently is just the circle at its base
bool HitTest ( const FRay & Ray, [FHitResult](API\Runtime\Engine\Engine\FHitResult) & OutHit, FVector & OutAxis, FTransform & OutTransform )